US 11,919,995 B2
Epoxy resin, epoxy resin composition, epoxy resin cured product, and composite material
Naoki Maruyama, Tokyo (JP); Tomoko Higashiuchi, Tokyo (JP); Kazumasa Fukuda, Tokyo (JP); Hideyuki Katagi, Tokyo (JP); Yuki Nakamura, Tokyo (JP); and Yoshitaka Takezawa, Tokyo (JP)
Assigned to RESONAC CORPORATION, Tokyo (JP)
Appl. No. 16/970,955
Filed by RESONAC CORPORATION, Tokyo (JP)
PCT Filed Feb. 18, 2019, PCT No. PCT/JP2019/005881
§ 371(c)(1), (2) Date Aug. 19, 2020,
PCT Pub. No. WO2019/160143, PCT Pub. Date Aug. 22, 2019.
Claims priority of application No. 2018-026891 (JP), filed on Feb. 19, 2018.
Prior Publication US 2020/0392282 A1, Dec. 17, 2020
Int. Cl. C08G 59/24 (2006.01); C08G 59/28 (2006.01); C08G 59/30 (2006.01); C08G 59/50 (2006.01); C08K 3/04 (2006.01); C08L 63/00 (2006.01); B32B 27/38 (2006.01); C08J 5/24 (2006.01)
CPC C08G 59/245 (2013.01) [C08G 59/5033 (2013.01); C08K 3/04 (2013.01)] 14 Claims
 
1. An epoxy resin, comprising an epoxy compound having two or more mesogenic structures, and having a loss tangent of 1 or more at 35° C. before curing,
wherein the epoxy compound has a structure represented by the following Formula (1-B):

OG Complex Work Unit Chemistry
wherein, in Formula (1-B), each of R1 and R2 independently represents an alkyl group having 1 to 8 carbon atoms; X represents a single bond or a linking group that includes at least one divalent group selected from the following Group (A); each Y independently represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, a nitro group or an acetyl group; each Z independently represents —O— or —NH—; each m independently represents an integer from 0 to 4; and each n independently represents an integer from 0 to 4:

OG Complex Work Unit Chemistry
wherein, in Group (A), each Y independently represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a cyano group, a nitro group or an acetyl group; k represents an integer from 0 to 7; l represents an integer from 0 to 12; m represents an integer from 0 to 8; and each n independently represents an integer from 0 to 4.
 
9. An epoxy resin composition, comprising the epoxy resin according to claim 1 and a curing agent.
 
12. An epoxy resin cured product, which is obtained by curing the epoxy resin composition according to claim 9.
 
13. A composite material, comprising the epoxy resin cured product according to claim 12 and a reinforcing material.
 
14. The composite material according to claim 13, wherein the reinforcing material comprises a carbon material.